Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 22,824	$ 34,698
Available-for-sale, Less than 12 months, Unrealized Losses	(1,266)	(843)
Available-for-sale, 12 months or longer, Fair Value	1,001,277	1,075,835
Available-for-sale, 12 months or longer, Unrealized losses	(193,568)	(192,616)
Available-for-sale, Total Fair Value	1,024,101	1,110,533
Available-for-sale, Total Unrealized Losses	(194,834)	(193,459)
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	1,340	1,288
Available-for-sale, Less than 12 months, Unrealized Losses	0	(4)
Available-for-sale, 12 months or longer, Fair Value	189,327	210,069
Available-for-sale, 12 months or longer, Unrealized losses	(21,158)	(26,215)
Available-for-sale, Total Fair Value	190,667	211,357
Available-for-sale, Total Unrealized Losses	(21,158)	(26,219)
Obligations of States and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	20,349	22,281
Available-for-sale, Less than 12 months, Unrealized Losses	(1,248)	(333)
Available-for-sale, 12 months or longer, Fair Value	241,502	241,630
Available-for-sale, 12 months or longer, Unrealized losses	(55,193)	(49,038)
Available-for-sale, Total Fair Value	261,851	263,911
Available-for-sale, Total Unrealized Losses	(56,441)	(49,371)
Mortgage-backed Securities: GSE Residential
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	1,135	5,818
Available-for-sale, Less than 12 months, Unrealized Losses	(18)	(67)
Available-for-sale, 12 months or longer, Fair Value	511,746	566,197
Available-for-sale, 12 months or longer, Unrealized losses	(114,552)	(113,007)
Available-for-sale, Total Fair Value	512,881	572,015
Available-for-sale, Total Unrealized Losses	(114,570)	(113,074)
Other Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	0	5,311
Available-for-sale, Less than 12 months, Unrealized Losses	0	(439)
Available-for-sale, 12 months or longer, Fair Value	58,702	57,939
Available-for-sale, 12 months or longer, Unrealized losses	(2,665)	(4,356)
Available-for-sale, Total Fair Value	58,702	63,250
Available-for-sale, Total Unrealized Losses	$ (2,665)	$ (4,795)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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